Process for dyeing and printing cellulose esters and cellulose ethers



Patented June 17, 1930 UNITED STATES PATENT OFFICE Enron FISCHER ANDcam. ERICH Mfi'LLER,

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RATIQN or nmnwm or NEW YORK, 11.1., A Conror'nocnss FOR DYELNG ANDrnmmmo CELLULOSE nsrnns AND oELLuLosE nrnnns Our present inventionrelates to a process for dyeing and printing cellulose esters andcellulose ethers and to the dyed cellulose derivatives thus obtainable.

We have found that the azo dyestuffs of the general formula:

- arr-rang wherein R represents an aryl group which may be substitutedbut does not contain more than one sulfonic acid group and X representsa monovalent substituent,-yield excelyield dyeings of particularly goodproper- 3o ties as to fastness to light and chlorine.

. The following examples serve to illustrate our invention but theylimit it thereto:

1.- 1 kilo of acetate silk is dyed from to 1 hour at (SO-70 C. in adyebath containing 20-25 liters of water in which 20 g. of the dyestuifpara-phenylenediamine para-cresol of the following formula:

on 7 I GHQ m are dissolved. In this manner a vivid goldenlose esters andethers are not intended to p Io Drawing. Application filed April 20,1927, Serial No. 185,355, and in Germany April 28, 1926.

yellow dyeing of good fastness to light and chlorine is obtained.

If for the dyestufi' as used in the forego-.

0.0K; HI

there is produced on the acetate silk a beautiful greenish-yellow dyeingof ver good properties as to fastness. The dyestuffmetachloraniline-apara-cresol as Well as the dyestuifpara-phenyl'enediamine-ortho-sulfonic acidpara-cresol dyes the fiber abeautiful yellow shade.

In the following claims the term dyeing formula processes.

is intended'to include printing and any other (1 ein We claim 1. Theprocess which comprises dyeing a compound of the group consisting ofcelluwith a mono-azo dye of the general formula:

wherein R represents an aryl residue which may be substituted but doesnot contain more than one sulfonic acid group and X represents amonovalent substituent.

2. The process which comprises dyeing a or HOCHST-ON-THEMAIN, GERMANY,

compound of the group consisting of cellulose esters and ethers with amono-azo dye of the general formula:

Mag

'series which may wherein Y represents hydrogen or an acidyl group.

A. The process which comprises dyeing a cellulose esters and ethers,dyediwith a monoazo dye of the following formula:-

I HNON: (Loom In testimony whereof "we afiix ourlsignatures.

ERICH FISCHER. 75

CARL ERICH MI jLLER. 4

" compound of the group consisting of cellulose esters and ethers withthe mono-azo -dye of the following formula:

I I l a H 0:011; I H; I

5.l,A compound of the group consisting of a cellulose esters and ethers,dyed with a monoazo dye of the general formula:

v v NQ wherein R represents an aryl residuewhich may be substituted butdoes not contain more than one sulfonic acid group and X represents amonovalent substituent. I

6. A compound of the group consisting of cellulose esters and ethers,dyed with a monoazo dye of the general formula:

Hag

wherein R represents a residue of the benzene series which may besubstituted but does not contain more than one sulfonic acid group and Xrepresents a monovalent substitutent.

7. A compound of the group consisting of" cellulose esters and ethers,dyed with a monoazo dye of the general formula:

on H' .l H v r wherein represents hydroge'fi or an acidyl group.

8. A compound of the group consisting of

